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Questions and Answers
What are two examples of the cut-through switching method?
What are two examples of the cut-through switching method?
- QOS switching and fast-forward switching (correct)
- QOS switching and store-and-forward switching
- Store-and-forward switching and CRC switching
- Fast-forward switching and fragment-free switching
What action will occur if a switch receives a frame and does not have the source MAC address in the MAC table?
What action will occur if a switch receives a frame and does not have the source MAC address in the MAC table?
- The switch forwards the frame to the associated port.
- The switch shares the MAC address table entry with any connected switches.
- The switch adds it to its MAC address table associated with the port number.
- The switch sends the frame to a connected router because the destination MAC address is not local. (correct)
What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?
What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?
- The switch shares the MAC address table entry with any connected switches.
- The switch does not forward the frame.
- The switch sends the frame to a connected router because the destination MAC address is not local.
- The switch refreshes the timer on that entry. (correct)
What does cut-through switching involve?
What does cut-through switching involve?
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What is the purpose of fragment-free switching?
What is the purpose of fragment-free switching?
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Study Notes
Switching Methods
- Cut-through switching method involves forwarding a frame as soon as the destination MAC address is read, without waiting for the entire frame to arrive.
- Two examples of cut-through switching method are fast-forward and fragment-free switching.
MAC Table Operations
- If a switch receives a frame and does not have the source MAC address in the MAC table, it will add the source MAC address to the table.
- If a switch receives a frame and does have the source MAC address in the MAC table, it will not add it again and will simply forward the frame.
Fragment-Free Switching
- Fragment-free switching involves waiting for the first 64 bytes of a frame to arrive before forwarding it, to ensure that any fragments are not forwarded.
- The purpose of fragment-free switching is to minimize the forwarding of invalid frames.
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